Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2006-R.Weller

Mineral Information on:

Chemical Group:    silicate

Chemical Formula:   

Color:  light brown, grayish brown, pale gray, grayish green, pale olive green

Transparency:  transparent to translucent                                                                         

Streak: uncolored                  Fracture:  uneven


Hardness:  6 to 7                Specific Gravity:  3.23 to 3.24                 

Cleavage:  (010) perfect


Crystal Forms: Monoclinic system
     Crystal are long and thin, tending to fibrous

Mineral Associations:  corundum, cordierite, andalusite

Identifying Characteristics:


Occurrences:  Connecticut, New York, North Carolina

Toxicity:      when-swallowed- low         when inhaled- high

Additional Information: